Description
The ext4_iget function in fs/ext4/inode.c in the Linux kernel through 4.15.15 mishandles the case of a root directory with a zero i_links_count, which allows attackers to cause a denial of service (ext4_process_freed_data NULL pointer dereference and OOPS) via a crafted ext4 image.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Linux kernel through version 4.15 | Linux kernel through version 4.15 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 4.15.17-1 | — |
| Debian 13 | linux | 4.15.17-1 | — |
| Debian 12 | linux | 4.15.17-1 | — |
| Debian 9 | linux | 4.9.88-1 | DSA-4188-1 |
| Debian 8 | linux | 3.16.56-1 | DSA-4187-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | linux | 3.2.101-1 | DLA-1369-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-gcp-6.11 +4 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +3 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-23.25 | USN-3678-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1010.10 | USN-3678-1 |
| Ubuntu 18.04 LTS | linux-azure | 4.15.0-1013.13 | USN-3678-3 |
| Ubuntu 18.04 LTS | linux-gcp | 4.15.0-1009.9 | USN-3678-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1011.11 | USN-3678-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1008.11 | — |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1012.13 | USN-3678-4 |
| Ubuntu 16.04 LTS | linux | 4.4.0-128.154 | USN-3676-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1061.70 | USN-3676-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1013.13~16.04.2 | USN-3678-2 |
| Ubuntu 16.04 LTS | linux-gcp | 4.13.0-1019.23 | USN-3677-2 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-24.26~16.04.1 | USN-3677-2 |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1027.32 | USN-3676-1 |
| Ubuntu 16.04 LTS | linux-oem | 4.13.0-1030.33 | USN-3677-2 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1091.99 | USN-3676-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1094.99 | USN-3676-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux | 3.13.0-157.207 | USN-3754-1 |
| Ubuntu 14.04 LTS | linux-aws | 4.4.0-1023.23 | USN-3676-2 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-128.154~14.04.1 | USN-3676-2 |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1008.10 | — |
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | kernel-alt +1 | 4.14.0-115.el7a | RHSA-2018:2948 |
| RHEL 7 | kernel-rt +10 | 3.10.0-957.rt56.910.el7 | RHSA-2018:3096 |
| RHEL 7 | perf +18 | 3.10.0-957.el7 | RHSA-2018:3083, RHSA-2018:2948 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | kernel-docs +6 | 4.12.14-25.3.1 | SUSE-SU-2018:2092-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.85.1 | SUSE-SU-2018:1855-2, SUSE-SU-2018:1855-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_23 | 1-3.5.1 | SUSE-SU-2018:1855-2, SUSE-SU-2018:1855-1 |
| SLES 12 SP1 | kernel-xen +3 | 3.12.74-60.64.96.1 | SUSE-SU-2018:1761-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_29 | 1-2.3.1 | SUSE-SU-2018:1761-1 |
| SLES 12 | kernel-ec2 +4 | 3.12.61-52.136.1 | SUSE-SU-2018:1762-1, SUSE-SU-2018:1761-1 |
| SLES 12 | kgraft-patch-SLE12_Update_36 | 1-1.3.1 | SUSE-SU-2018:1762-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.85.1 | SUSE-SU-2018:1855-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_23 | 1-3.5.1 | SUSE-SU-2018:1855-1 |
| SLES for SAP 12 SP1 | kernel-xen +3 | 3.12.74-60.64.96.1 | SUSE-SU-2018:1761-1 |
| SLES for SAP 12 SP1 | kgraft-patch-SLE12-SP1_Update_29 | 1-2.3.1 | SUSE-SU-2018:1761-1 |
| SLE Real Time 12 SP3 | kernel-rt +3 | 4.4.138-3.14.1 | SUSE-SU-2018:1816-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-25.3.1 | SUSE-SU-2018:2092-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_1 | 1-1.3.1 | SUSE-SU-2018:2092-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.85.1 | SUSE-SU-2018:1855-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_23 | 1-3.5.1 | SUSE-SU-2018:1855-1 |
| SUSE Enterprise Storage 4 | kernel-syms +2 | 4.4.121-92.85.1 | SUSE-SU-2018:1855-1 |
| SUSE Enterprise Storage 4 | kgraft-patch-SLE12-SP2_Update_23 | 1-3.5.1 | SUSE-SU-2018:1855-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-3.8.13-118.29.1.el6uek | 0.4.5-3.el6 | ELSA-2019-4316 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.29.1.el7uek | 0.4.5-3.el7 | ELSA-2019-4316 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-118.29.1.el7uek | ELSA-2019-4316, ELSA-2019-4315 |
| Oracle Linux 7 | perf +12 | 3.10.0-957.el7 | ELSA-2018-3083 |
Advisories 24
- RHSA-2018:3083 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 8, 2026
- RHSA-2018:3096 Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 8, 2026
- RHSA-2018:2948 Red Hat Security Advisory: kernel-alt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- USN-3754-1 linux vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3678-1 linux, linux-aws, linux-gcp, linux-kvm vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3676-1 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4188-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4187-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1369-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3678-2 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3678-3 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3678-4 linux-raspi2 vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3676-2 linux-lts-xenial, linux-aws vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3677-2 linux-hwe, linux-gcp, linux-oem vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2018:1855-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2092-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1762-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1855-2 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2022-0532 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 11, 2025
- SUSE-SU-2018:1816-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2018:1761-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2019-4316 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 4, 2019
- ELSA-2019-4315 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 3, 2019
- ELSA-2018-3083 Important: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 5, 2018
References
- USN-3676-1 vendor-advisory
- USN-3678-2 vendor-advisory
- RHSA-2018:3083 vendor-advisory
- http://openwall.com/lists/oss-security/2018/03/29/1
- DSA-4187 vendor-advisory
- USN-3678-1 vendor-advisory
- USN-3677-1 vendor-advisory
- DSA-4188 vendor-advisory
- USN-3754-1 vendor-advisory
- https://bugzilla.kernel.org/show_bug.cgi?id=199179
- RHSA-2018:2948 vendor-advisory
- USN-3678-3 vendor-advisory
- USN-3677-2 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1560777
- USN-3676-2 vendor-advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=8e4b5eae5decd9dfe5a4ee369c22028f90ab4c44
- [debian-lts-announce] 20180502 [SECURITY] [DLA 1369-1] linux security update mailing-list
- RHSA-2018:3096 vendor-advisory
- USN-3678-4 vendor-advisory
- https://bugzilla.kernel.org/show_bug.cgi?id=199275